package com.mfizz.util;

/*
 * #%L
 * mfz-util
 * %%
 * Copyright (C) 2012 mfizz
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

/**
 * 
 */
public class FileUtil {
    /**
     * Parse the filename and return the file extension.
     */
    public static String parseFileExtension(String filename) {
        // if null, return null
        if (filename == null) {
            return null;
        }
        // find position of last period
        int pos = filename.lastIndexOf('.');
        // did one exist or have any length?
        if (pos < 0 || (pos+1) >= filename.length()) {
            return null;
        }
        // parse extension
        return filename.substring(pos+1);
    }
}
